﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo01
{
    class Circle : Shape
    {
        public Circle(int sideLen) :base(sideLen)
        {
        
            Console.WriteLine("圆面积：{0}",sideLen*sideLen*Math.PI);
        }
    }
}
